U.S. joins other nations in grounding 737 MAX jets after second crash

The United States on Wednesday joined Europe, China and other countries in grounding Boeing Co’s 737 MAX jets, because of safety concerns after an Ethiopian Airlines plane crash that killed 157 people, the second disaster involving the 737 in less than five months.The world’s biggest plane-maker is facing its most serious crisis in years, as the decades-old 737 program, one of its most reliable sources of cash and profits, takes a severe blow to its prestige.